Transformerless DCamp;#x2013;DC Converters With High Step-Up Voltage Gain

doi:10.1109/TIE.2009.2022512

Transformerless DCamp;#x2013;DC Converters With High Step-Up Voltage Gain

by Lung-Sheng Yang Lung-Sheng Yang, Tsorng-Juu Liang Tsorng-Juu Liang, Jiann-Fuh Chen Jiann-Fuh Chen

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IEEE Transactions on Industrial Electronics (2009)

Volume: 56, Issue: 8, Pages: 3144-3152

ISSN: 02780046
DOI: 10.1109/TIE.2009.2022512

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Abstract

Conventional dc-dc boost converters are unable to provide high step-up voltage gains due to the effect of power switches, rectifier diodes, and the equivalent series resistance of inductors and capacitors. This paper proposes transformerless dc-dc converters to achieve high step-up voltage gain without an extremely high duty ratio. In the proposed converters, two inductors with the same level of inductance are charged in parallel during the switch-on period and are discharged in series during the switch-off period. The structures of the proposed converters are very simple. Only one power stage is used. Moreover, the steady-state analyses of voltage gains and boundary operating conditions are discussed in detail. Finally, a prototype circuit is implemented in the laboratory to verify the performance.